common/view.py
author Emile Anclin <emile.anclin@logilab.fr>
Thu, 02 Apr 2009 18:57:24 +0200
changeset 1221 d474534fd04d
parent 962 1cc3c240b2d5
child 985 6a25c58a1c23
permissions -rw-r--r--
[doc] improve Concept explainings
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"""abstract views and templates classes for CubicWeb web client
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from cStringIO import StringIO
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from logilab.mtconverter import html_escape
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from cubicweb import NotAnEntity, NoSelectableObject
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from cubicweb.common.registerers import accepts_registerer, priority_registerer
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from cubicweb.common.selectors import (chainfirst, match_user_group, accept,
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                                       nonempty_rset, empty_rset, none_rset)
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from cubicweb.common.appobject import AppRsetObject, ComponentMixIn
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from cubicweb.common.utils import UStringIO, HTMLStream
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_ = unicode
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# robots control
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NOINDEX = u'<meta name="ROBOTS" content="NOINDEX" />'
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NOFOLLOW = u'<meta name="ROBOTS" content="NOFOLLOW" />'
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CW_XHTML_EXTENSIONS = '''[
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  <!ATTLIST html xmlns:cubicweb CDATA  #FIXED \'http://www.logilab.org/2008/cubicweb\'  >
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<!ENTITY % coreattrs
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 "id          ID            #IMPLIED
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  class       CDATA         #IMPLIED
385ce5e0b30b cubicweb__loadurl -> cubicweb:lazyloadurl
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  style       CDATA         #IMPLIED
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  title       CDATA         #IMPLIED
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 cubicweb:sortvalue         CDATA   #IMPLIED
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 cubicweb:target            CDATA   #IMPLIED
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 cubicweb:limit             CDATA   #IMPLIED
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 cubicweb:type              CDATA   #IMPLIED
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 cubicweb:loadtype          CDATA   #IMPLIED
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 cubicweb:wdgtype           CDATA   #IMPLIED
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 cubicweb:initfunc          CDATA   #IMPLIED
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 cubicweb:inputid           CDATA   #IMPLIED
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 cubicweb:tindex            CDATA   #IMPLIED
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 cubicweb:inputname         CDATA   #IMPLIED
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 cubicweb:value             CDATA   #IMPLIED
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 cubicweb:required          CDATA   #IMPLIED
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 cubicweb:accesskey         CDATA   #IMPLIED
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 cubicweb:maxlength         CDATA   #IMPLIED
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 cubicweb:variables         CDATA   #IMPLIED
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 cubicweb:displayactions    CDATA   #IMPLIED
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 cubicweb:fallbackvid       CDATA   #IMPLIED
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 cubicweb:vid               CDATA   #IMPLIED
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 cubicweb:rql               CDATA   #IMPLIED
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 cubicweb:actualrql         CDATA   #IMPLIED
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 cubicweb:rooteid           CDATA   #IMPLIED
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 cubicweb:dataurl           CDATA   #IMPLIED
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 cubicweb:size              CDATA   #IMPLIED
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 cubicweb:tlunit            CDATA   #IMPLIED
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 cubicweb:loadurl           CDATA   #IMPLIED
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 cubicweb:uselabel          CDATA   #IMPLIED
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 cubicweb:facetargs         CDATA   #IMPLIED
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 cubicweb:facetName         CDATA   #IMPLIED
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  "> ] '''
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TRANSITIONAL_DOCTYPE = u'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" %s>\n'
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STRICT_DOCTYPE = u'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" %s>\n'
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class View(AppRsetObject):
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    """abstract view class, used as base for every renderable object such
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    as views, templates, some components...web
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    A view is instantiated to render a [part of a] result set. View
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    subclasses may be parametred using the following class attributes:
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    * `templatable` indicates if the view may be embeded in a main
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      template or if it has to be rendered standalone (i.e. XML for
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      instance)
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    * if the view is not templatable, it should set the `content_type` class
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      attribute to the correct MIME type (text/xhtml by default)
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    * the `category` attribute may be used in the interface to regroup related
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      objects together
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    At instantiation time, the standard `req`, `rset`, and `cursor`
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    attributes are added and the `w` attribute will be set at rendering
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    time to a write function to use.
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    """
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    __registry__ = 'views'
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    templatable = True
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    need_navigation = True
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    # content_type = 'application/xhtml+xml' # text/xhtml'
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    binary = False
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    add_to_breadcrumbs = True
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    category = 'view'
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    def __init__(self, req, rset):
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        super(View, self).__init__(req, rset)
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        self.w = None
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    @property
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    def content_type(self):
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        if self.req.xhtml_browser():
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            return 'application/xhtml+xml'
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        return 'text/html'
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    def set_stream(self, w=None):
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        if self.w is not None:
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            return
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        if w is None:
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            if self.binary:
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                self._stream = stream = StringIO()
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            else:
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                self._stream = stream = UStringIO()
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            w = stream.write
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        else:
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            stream = None
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        self.w = w
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        return stream
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    # main view interface #####################################################
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    def dispatch(self, w=None, **context):
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        """called to render a view object for a result set.
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        This method is a dispatched to an actual method selected
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        according to optional row and col parameters, which are locating
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        a particular row or cell in the result set:
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0
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        * if row [and col] are specified, `cell_call` is called
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        * if none of them is supplied, the view is considered to apply on
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          the whole result set (which may be None in this case), `call` is
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          called
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        """
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        row, col = context.get('row'), context.get('col')
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        if row is not None:
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            context.setdefault('col', 0)
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            view_func = self.cell_call
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        else:
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            view_func = self.call
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        stream = self.set_stream(w)
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        # stream = self.set_stream(context)
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        view_func(**context)
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        # return stream content if we have created it
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        if stream is not None:
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            return self._stream.getvalue()
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   148
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    # should default .call() method add a <div classs="section"> around each
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    # rset item
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    add_div_section = True
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0
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    def call(self, **kwargs):
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        """the view is called for an entire result set, by default loop
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        other rows of the result set and call the same view on the
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        particular row
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   157
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        Views applicable on None result sets have to override this method
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   159
        """
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        rset = self.rset
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        if rset is None:
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            raise NotImplementedError, self
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   163
        wrap = self.templatable and len(rset) > 1 and self.add_div_section
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        for i in xrange(len(rset)):
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   165
            if wrap:
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   166
                self.w(u'<div class="section">')
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            self.wview(self.id, rset, row=i, **kwargs)
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   168
            if wrap:
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   169
                self.w(u"</div>")
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   170
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   171
    def cell_call(self, row, col, **kwargs):
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        """the view is called for a particular result set cell"""
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   173
        raise NotImplementedError, self
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   174
0
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   175
    def linkable(self):
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        """return True if the view may be linked in a menu
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0
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        by default views without title are not meant to be displayed
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   179
        """
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   180
        if not getattr(self, 'title', None):
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   181
            return False
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   182
        return True
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   183
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   184
    def is_primary(self):
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   185
        return self.id == 'primary'
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   186
0
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   187
    def url(self):
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   188
        """return the url associated with this view. Should not be
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   189
        necessary for non linkable views, but a default implementation
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   190
        is provided anyway.
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   191
        """
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   192
        try:
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   193
            return self.build_url(vid=self.id, rql=self.req.form['rql'])
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   194
        except KeyError:
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   195
            return self.build_url(vid=self.id)
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   196
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   197
    def set_request_content_type(self):
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   198
        """set the content type returned by this view"""
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   199
        self.req.set_content_type(self.content_type)
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   200
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   201
    # view utilities ##########################################################
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   202
0
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   203
    def view(self, __vid, rset, __fallback_vid=None, **kwargs):
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        """shortcut to self.vreg.render method avoiding to pass self.req"""
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   205
        try:
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   206
            view = self.vreg.select_view(__vid, self.req, rset, **kwargs)
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   207
        except NoSelectableObject:
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   208
            if __fallback_vid is None:
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diff changeset
   209
                raise
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diff changeset
   210
            view = self.vreg.select_view(__fallback_vid, self.req, rset, **kwargs)
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89ad20af9e4c oops, these were committed unintentionnally
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diff changeset
   211
        return view.dispatch(**kwargs)
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   212
0
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   213
    def wview(self, __vid, rset, __fallback_vid=None, **kwargs):
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   214
        """shortcut to self.view method automatically passing self.w as argument
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diff changeset
   215
        """
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   216
        self.view(__vid, rset, __fallback_vid, w=self.w, **kwargs)
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   217
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   218
    def whead(self, data):
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   219
        self.req.html_headers.write(data)
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   220
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   221
    def wdata(self, data):
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   222
        """simple helper that escapes `data` and writes into `self.w`"""
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diff changeset
   223
        self.w(html_escape(data))
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diff changeset
   224
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   225
    def action(self, actionid, row=0):
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   226
        """shortcut to get action object with id `actionid`"""
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   227
        return self.vreg.select_action(actionid, self.req, self.rset,
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   228
                                       row=row)
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   229
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   230
    def action_url(self, actionid, label=None, row=0):
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   231
        """simple method to be able to display `actionid` as a link anywhere
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diff changeset
   232
        """
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   233
        action = self.vreg.select_action(actionid, self.req, self.rset,
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   234
                                         row=row)
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diff changeset
   235
        if action:
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diff changeset
   236
            label = label or self.req._(action.title)
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   237
            return u'<a href="%s">%s</a>' % (html_escape(action.url()), label)
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   238
        return u''
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   239
0
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   240
    def html_headers(self):
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   241
        """return a list of html headers (eg something to be inserted between
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   242
        <head> and </head> of the returned page
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   243
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        by default return a meta tag to disable robot indexation of the page
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   245
        """
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   246
        return [NOINDEX]
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   247
0
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   248
    def page_title(self):
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        """returns a title according to the result set - used for the
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   250
        title in the HTML header
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diff changeset
   251
        """
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   252
        vtitle = self.req.form.get('vtitle')
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diff changeset
   253
        if vtitle:
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   254
            return self.req._(vtitle)
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   255
        # class defined title will only be used if the resulting title doesn't
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   256
        # seem clear enough
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   257
        vtitle = getattr(self, 'title', None) or u''
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   258
        if vtitle:
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   259
            vtitle = self.req._(vtitle)
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   260
        rset = self.rset
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   261
        if rset and rset.rowcount:
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parents:
diff changeset
   262
            if rset.rowcount == 1:
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                try:
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                    entity = self.complete_entity(0)
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                    # use long_title to get context information if any
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                    clabel = entity.dc_long_title()
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                except NotAnEntity:
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                    clabel = display_name(self.req, rset.description[0][0])
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                    clabel = u'%s (%s)' % (clabel, vtitle)
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            else :
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                etypes = rset.column_types(0)
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                if len(etypes) == 1:
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                    etype = iter(etypes).next()
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                    clabel = display_name(self.req, etype, 'plural')
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                else :
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                    clabel = u'#[*] (%s)' % vtitle
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        else:
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            clabel = vtitle
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        return u'%s (%s)' % (clabel, self.req.property_value('ui.site-title'))
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    def output_url_builder( self, name, url, args ):
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        self.w(u'<script language="JavaScript"><!--\n' \
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               u'function %s( %s ) {\n' % (name, ','.join(args) ) )
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        url_parts = url.split("%s")
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        self.w(u' url="%s"' % url_parts[0] )
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        for arg, part in zip(args, url_parts[1:]):
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            self.w(u'+str(%s)' % arg )
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            if part:
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                self.w(u'+"%s"' % part)
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        self.w('\n document.window.href=url;\n')
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        self.w('}\n-->\n</script>\n')
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    def create_url(self, etype, **kwargs):
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        """ return the url of the entity creation form for a given entity type"""
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        return self.req.build_url('add/%s'%etype, **kwargs)
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0
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# concrete views base classes #################################################
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class EntityView(View):
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    """base class for views applying on an entity (i.e. uniform result set)
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    """
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    __registerer__ = accepts_registerer
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    __selectors__ = (accept,)
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    accepts = ('Any',)
0
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    category = 'entityview'
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0
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    def field(self, label, value, row=True, show_label=True, w=None, tr=True):
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        """ read-only field """
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        if w is None:
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            w = self.w
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        if row:
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   313
            w(u'<div class="row">')
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        if show_label:
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            if tr:
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                label = display_name(self.req, label)
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            w(u'<span class="label">%s</span>' % label)
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        w(u'<div class="field">%s</div>' % value)
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        if row:
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            w(u'</div>')
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0
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class StartupView(View):
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    """base class for views which doesn't need a particular result set
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    to be displayed (so they can always be displayed !)
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   326
    """
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    __registerer__ = priority_registerer
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    __selectors__ = (match_user_group, none_rset)
0
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    require_groups = ()
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    category = 'startupview'
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0
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    def url(self):
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        """return the url associated with this view. We can omit rql here"""
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        return self.build_url('view', vid=self.id)
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    def html_headers(self):
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        """return a list of html headers (eg something to be inserted between
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        <head> and </head> of the returned page
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        by default startup views are indexed
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        """
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        return []
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class EntityStartupView(EntityView):
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    """base class for entity views which may also be applied to None
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    result set (usually a default rql is provided by the view class)
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    """
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   349
    __registerer__ = accepts_registerer
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    __selectors__ = (chainfirst(none_rset, accept),)
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0
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    default_rql = None
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0
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    def __init__(self, req, rset):
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        super(EntityStartupView, self).__init__(req, rset)
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        if rset is None:
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            # this instance is not in the "entityview" category
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   358
            self.category = 'startupview'
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   359
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    def startup_rql(self):
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        """return some rql to be executedif the result set is None"""
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        return self.default_rql
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   363
0
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    def call(self, **kwargs):
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        """override call to execute rql returned by the .startup_rql
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        method if necessary
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   367
        """
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   368
        if self.rset is None:
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   369
            self.rset = self.req.execute(self.startup_rql())
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        rset = self.rset
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   371
        for i in xrange(len(rset)):
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   372
            self.wview(self.id, rset, row=i, **kwargs)
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    def url(self):
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        """return the url associated with this view. We can omit rql if we
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        are on a result set on which we do not apply.
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   377
        """
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   378
        if not self.__select__(self.req, self.rset):
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            return self.build_url(vid=self.id)
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   380
        return super(EntityStartupView, self).url()
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   382
0
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   383
class AnyRsetView(View):
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    """base class for views applying on any non empty result sets"""
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   385
    __registerer__ = priority_registerer
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diff changeset
   386
    __selectors__ = (nonempty_rset,)
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diff changeset
   387
0
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   388
    category = 'anyrsetview'
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diff changeset
   389
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diff changeset
   390
    def columns_labels(self, tr=True):
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diff changeset
   391
        if tr:
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diff changeset
   392
            translate = display_name
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diff changeset
   393
        else:
7e76f651314b fix rset xml view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 369
diff changeset
   394
            translate = lambda req, val: val
369
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   395
        rqlstdescr = self.rset.syntax_tree().get_description()[0] # XXX missing Union support
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   396
        labels = []
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   397
        for colindex, attr in enumerate(rqlstdescr):
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   398
            # compute column header
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   399
            if colindex == 0 or attr == 'Any': # find a better label
370
7e76f651314b fix rset xml view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 369
diff changeset
   400
                label = ','.join(translate(self.req, et)
369
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   401
                                 for et in self.rset.column_types(colindex))
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   402
            else:
370
7e76f651314b fix rset xml view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 369
diff changeset
   403
                label = translate(self.req, attr)
369
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   404
            labels.append(label)
c8a6edc224bb new rsetxml view, reusing most code from csvexport view
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 361
diff changeset
   405
        return labels
543
c0f2b6378f70 simplification of lazy tabs mechanism
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 522
diff changeset
   406
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   407
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   408
class EmptyRsetView(View):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   409
    """base class for views applying on any empty result sets"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   410
    __registerer__ = priority_registerer
237
3df2e0ae2eba begin selector renaming (work in progress)
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 0
diff changeset
   411
    __selectors__ = (empty_rset,)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   412
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   413
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   414
# concrete template base classes ##############################################
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   415
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   416
class Template(View):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   417
    """a template is almost like a view, except that by default a template
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   418
    is only used globally (i.e. no result set adaptation)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   419
    """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   420
    __registry__ = 'templates'
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   421
    __registerer__ = priority_registerer
361
5cd8bc047b52 update some selectors
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 355
diff changeset
   422
    __selectors__ = (match_user_group,)
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   423
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   424
    require_groups = ()
543
c0f2b6378f70 simplification of lazy tabs mechanism
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 522
diff changeset
   425
0
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   426
    def template(self, oid, **kwargs):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   427
        """shortcut to self.registry.render method on the templates registry"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   428
        w = kwargs.pop('w', self.w)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   429
        self.vreg.render('templates', oid, self.req, w=w, **kwargs)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   430
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   431
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   432
class MainTemplate(Template):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   433
    """main template are primary access point to render a full HTML page.
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   434
    There is usually at least a regular main template and a simple fallback
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   435
    one to display error if the first one failed
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   436
    """
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   437
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   438
    base_doctype = STRICT_DOCTYPE
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   439
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   440
    @property
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   441
    def doctype(self):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   442
        if self.req.xhtml_browser():
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   443
            return self.base_doctype % CW_XHTML_EXTENSIONS
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   444
        return self.base_doctype % ''
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   445
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   446
    def set_stream(self, w=None, templatable=True):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   447
        if templatable and self.w is not None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   448
            return
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   449
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   450
        if w is None:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   451
            if self.binary:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   452
                self._stream = stream = StringIO()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   453
            elif not templatable:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   454
                # not templatable means we're using a non-html view, we don't
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   455
                # want the HTMLStream stuff to interfere during data generation
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   456
                self._stream = stream = UStringIO()
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   457
            else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   458
                self._stream = stream = HTMLStream(self.req)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   459
            w = stream.write
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   460
        else:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   461
            stream = None
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   462
        self.w = w
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   463
        return stream
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   464
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   465
    def write_doctype(self, xmldecl=True):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   466
        assert isinstance(self._stream, HTMLStream)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   467
        self._stream.doctype = self.doctype
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   468
        if not xmldecl:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   469
            self._stream.xmldecl = u''
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   470
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   471
# viewable components base classes ############################################
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   472
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   473
class VComponent(ComponentMixIn, View):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   474
    """base class for displayable components"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   475
    property_defs = {
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   476
        'visible':  dict(type='Boolean', default=True,
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   477
                         help=_('display the component or not')),}
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   478
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   479
class SingletonVComponent(VComponent):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   480
    """base class for displayable unique components"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   481
    __registerer__ = priority_registerer